libnet-smtp-ssl-perl 1.03-1 (amd64 binary) in ubuntu zesty

 Net::SMTP::SSL implements the same API as Net::SMTP, but uses IO::Socket::SSL
 for its network operations. Due to the nature of Net::SMTP's new method, it is
 not overridden to make use of a default port for the SMTPS service. Perhaps
 future versions will be smart like that. Port 465 is usually what you want,
 and it's not a pain to specify that.